There is so much going on in this part of the sky! The bottom right hand part of the image is full of dark molecular clouds obscuring starlight. The famous Horsehead nebula, which is itself, a giant molecular cloud, rises up in a ghostly way into a background of lighter emission nebulae of warmer gas and dust heated by UV radiation from young stars forming nearby. Zeta Orionis, the bright star on the left is the leftmost star in Orions belt and blazes brilliantly with the Flame nebula beneath it, itself partly obscured by dark molecular clouds.